Differences between artificial intelligence and expert system
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Roughtly speaking, an expert system has some predefined rules of the form:
if A then B;if B & C then D…
Then, we give the system some input. And he make a lot of deductions (by inference) in a deterministic manner (the same inputs give the same output).
In the other hand, AI, is a general term which cover not just Expert Systems, but also Knowledge Representation, Planning and Machine Learning techniques which use a lot of probabilities calculations. Some techniques, as Deep Learning, don’t ever need the user to predefine the rules of the systems, they extract the rules automatically from data (we just define the model) and they are not deterministic (may gives different results for the same input).
Some people don’t consider Expert System as part of AI anymore. Some others consider that Machine Learning is an indepedant field also. But they have the same objective: to build a smart machine that can do smart tasks and give smart answers, which is basically, the definition of AI science.
Hope it helps! :-)
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